mukuro = chrome? what?
It was hard for me to undertsand this at first. I wondered how could this have possibly.. worked out? Mukuro is not Chrome and Chrome is not Mukuro, they are two separate characters "sharing" the same body. The body is Chrome, a female -- and I believe that Mukuro can see through her eyes (otherwise how would he know what was going on?!), but when Mukuro materializes, his body takes over hers and that's why he's able to carry out his look without, you know, being her and looking like a transvestite. This sort of works the same way as the possession bullet - only this time, Mukuro can feel tired, can feel pain.. when existing materialized together (in different bodies), she can bleed the same time he bleeds. It's a very odd phenomenon but it's very much proven in the future arc. Once TYL!Mukuro loses his life, Chrome is at the edge of losing her own life as well. On top of that, she bleeds along with him. Their existance is tied together very strongly, though I don't know what deal or contract was made between them. This was not the doing of the possession bullet, but something else entirely that hasn't been fully recognized in the series yet.